Biology Notes January 28, 2008 Fungi:-heterotrophs-nonphotosynthetic-decomposers with external digestion-cell walls of chitin (same an insect exoskeleton)-filamentous cell with tip growth (hypha)-economically very important (fermentation, antibiotics)-zygotic life cycles, with varying degrees of specialization-fungi can penetrate the substrate Differences between groups:-Fungi vary in terms of their structure and reproduction. Zygomycota:-‘bread mold’-simple construction, no cross walls-haploid cell that does not do cytokinesis so there are many nuclei in the growth tips-meiosis produces spores Ascomycota:-“sac fungi” or “cup fungi”-similar to zygomycota in +/- mating strains-cellular differences:

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Unformatted text preview: -hyphae with partial septa, no nuclei transfer between the septa-at the time of sexual reproduction 2 important features: 1) heterokaryon - A cell having two or more genetically different nuclei. 2) form a fruiting structure from heterokaryotic hyphae Biology Notes January 28, 2008 The zygote is formed in the asci (ascus), this is where meiosis occurs. Vocabulary: Asci - the sac in ascomycetes in which the sexual spores are formed. heterokaryon - A cell having two or more genetically different nuclei. Heterotrophs - An organism that cannot manufacture its own food and instead obtains its food and energy by taking in organic substances, usually plant or animal matter....
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